I feel like I have weakness in my legs and possibly left arm?

I don't really know how to test for weakness. I can still walk around and such and can still use my arm..but it just doesn't feel right. I have been having headaches. I've had them my whole life but they're becoming more frequent and painful. I've been getting dizzy. I'm pretty sure the weakness is only in my left hand. Last light my left wrist started hurting really bad so I may have carpal tunnel. But idk about my legs. I haven't had anything to eat yet today. And my sleep pattern has been waayyy off this week. I haven't been getting the sleep I need. I have been having pain in my neck with the headaches. I'm pretty sure it's not stiffness cause I can move my chin to my chest with no pain. I'm getting a little concerned. I'm worried I have a brain tumor. My doctors have told me it's migraines and stress. I just worry cause I had a friend who had headaches and diarhea and nausea and missed periods and the dismissed it as stress also and she ended up collapsing and dying from a brain tumor. I don't know what to do. I've been to several doctors and they all tell me the same thing. I have normal blood pressure and I heard that's a good sign. And my headaches respond to over the counter meds and I heard that was a good sign as well. Please help me out. I'm very concerned.